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I know what spit means, and I know what rat means, but what does to spit a rat mean? I was unable to find any idiomatic meaning in the dictionaries either in the entry for rat or spit. The literal meaning just seems too absurd or random.

I came across the phrase when I was rereading The Hitchhiker's Guide To The Galaxy. When Zaphod Beeblebrox tries to remember why he has carved his own initials into his brain, he says:

I don't seem to be letting myself into any of my secrets. Still I can understand that. I wouldn't trust myself further than I could spit a rat.

Will I have to attribute this weird combination of words to Zaphod Beeblebrox's eccentricity (or the author's, perhaps?) or does it have an idiomatic meaning?

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Personally I use the variant "as far as I could happily spit a rat". Not sure where I heard it. – Wudang Apr 15 '12 at 21:56

3 Answers 3

up vote 5 down vote accepted

The original coinage seems to be from Ira Wolfert's 1943 novel Tucker's People, as...

I'd kill you just as fast as I'd spit a rat out of my mouth, you son of a bitch.

Much later in The Hitchhiker's Guide to the Galaxy (1989), Douglas Adams picked it up as...

I wouldn't trust myself further than I could spit a rat.

I have to admit I find Adams' usage "odd". I'd expect the the imagery to focus on how quickly you want that rat out of your mouth, not how far away from your mouth you want to eject it.

Usually when talking about how "[not] far" we trust someone, the image focusses on what a short distance that is (as far as I could throw him). The reader has no special wish to imagine throwing [him] at all - he just knows if he did, it wouldn't be very far. He doesn't "want more" distance; rather he "accepts it will be less".

But on imagining a rat in his mouth, apart from the fact that primarily the reader wants it out fast, he naturally "wants more" distance, because it's repulsive. That's why it's an "odd" usage - the reader's "more distance" inclination works against the writer's "less distance" intention.

The "spit a rat" usage isn't particularly common anyway, but (possibly because Adams is more well-known than Wolfert), the "not far" sense seems more prevalent than "very fast".

I agree with Joel Brown that Adams' was probably being deliberately quirky, and knew he was mangling the original meaning (it's almost a "mixed metaphor" to me). But I doubt he expected it to be so closely scrutinised - here on ELU, or anywhere else for that matter!

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Good analysis (+1) - I'd add that it is possible that Adams was going for a deliberate subtle abuse of a relatively common idiom in order to achieve comedic effect. Zaphod Beeblebrox is, after all, a very offbeat character and it would be like him to coin slightly skewed phrases. – Joel Brown Apr 16 '12 at 0:48
@Joel Brown: Yeah - I think that too. Adams liked poking gentle fun at existing idioms, stereotypes, etc. I can't be certain Wolfert's usage was totally original, but I reckon Adams knew of it and deliberately mangled it a bit. Partly to suit his context, partly as you say because Adams' writing in general, and Beeblebrox in particular, are pretty quirky anyway. – FumbleFingers Apr 16 '12 at 1:01
Without context, I pictured a rotisserie rat, cooking over a campfire; not something I'd enjoy. But in context I agree that a person, however far they might want to spit the rat out of their mouths, couldn't make it go very far. Still, a very odd usage. – TecBrat Aug 10 '12 at 12:43
You'd want as much possible distance between your mouth and the rat, true; but unlike throwing it, attempting to spit an entire rat would probably not get you very far, so the logical conclusion is still that “as far as I could spit a rat” = a very short distance, which is what the turn of phrase requires. – Janus Bahs Jacquet Aug 5 '14 at 13:15

This kind of expression – an image that alludes to a relatively short distance – is often used to convey a lack of trust:

"I wouldn't trust him as far as I could throw him."

is probably the most common. A variation is:

"I woudn't trust him as far as I could kick him."

Yet another version:

"I wouldn't trust him as far as I could spit."

Adams is a rather original author; it's no surprise he has found a way to give a relatively common expression a unique twist. A rat seems like a good choice, too, since rats are a spittable size, and "rat" is a derogatory slang term often hung on those who can't be trusted – particularly those who have betrayed some circle.

Google search results: 
I wouldn't trust him as far as I could throw him: 77,000+  
I wouldn't trust him as far as I could kick him: 3,000+  
I wouldn't trust him as far as I could spit: almost 5,000  
I wouldn't trust him as far as I could spit a rat: 7  
(all searches in quotes)
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My only misgiving about this is "rats are a spittable size". Spitting a rat would be extremely difficult, verging on impossible, and I think that's the intent. You read the more common phrase "as far as I could spit" and then the "a rat" on the end turns it into something absurd. – Rupe Aug 5 '14 at 13:31
@Rupe - A rat is more "spittable" than, say, a kangaroo, which couldn't even fit in one's mouth. By "spittable" I only meant to say "able to fit in someone's mouth," not "small and aerodynamic like a watermelon seed." – J.R. Aug 6 '14 at 8:30

Adams's writing often uses double meaning that relies on being literal. That is to say that he tends to use idiomatic prose to evoke its literal meaning, or to simplify complex subjects to their most basic abstraction to create humour or point out absurdity.

For example, when talking about Earth, he sums up existential crisis, monetary trade, and the value of wealth as follows:

"This planet has — or rather had — a problem, which was this: most of the people living on it were unhappy for pretty much all of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movement of small green pieces of paper, which was odd because on the whole it wasn't the small green pieces of paper that were unhappy." [Hitchhiker's Guide To the Galaxy (book), chapter 1]

In this, the humour is from the fact that, quite literally, it is absurd to use the movement of green pieces of paper to remedy unhappiness on a large scale.

It is worth noting that Douglas Adams was a British writer, and in Europe, Brown and Black rats are most common. The average Brown Rat's body is in the region of 8 inches long (As noted here) they also, from personal experience have a diameter of around 1.5 inches. If you take into account their tail, it is probably fair to estimate their volume as a cylinder 8 inches long, and 1.5 inches in diameter, or about 14 cubic inches.

And so, my understanding of the passage:

What he is suggesting is the literal distance a human being (both Ford Prefect and Zaphod Beeblebrox are establish in visual media and in the books as being near-identical to humans externally, barring the occasional extra appendage.) could spit a rat (or, as Ford Prefect states at one point "Comfortably spit out a rat") in a physical sense. An average baseball has a similar volume to a rat, and a tennis ball is smaller. If you take a tennis ball as an idealized rat for spitting (significantly smaller, and immobile, but still hairy) and tried to spit it out, having somehow managed to lodge it in your mouth, you would run up against two problems: Large solid objects are hard to spit out, and hairy object are hard to spit out. You couldn't spit it very far. If you added the movement of a rodent thoroughly displeased with being in your mouth to that, and it may in fact be impossible to spit out a rat, or if possible, not possible to spit if far, and by analogy, not possible, or if possible not to a great extent, to trust the mentioned individual.

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